Troubleshooting Your System
Safety
WARNING: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. Before you begin this procedure, review the safety instructions that came with the system.
Troubleshooting System Startup Failure
If your system halts during startup prior to video imaging or LCD messaging, especially after installing an operating system or reconfiguring your system’s hardware, check for the following conditions:
•If you boot the system to the BIOS boot mode after installing an operating system from the UEFI Boot Manager, the system will hang. The reverse is also true. You must boot to the same boot mode in which you installed the operating system. See "Using the System Setup Program and UEFI Boot Manager" on page 57.
•Invalid memory configurations could cause the system to halt at startup without any video output. See "System Memory" on page 119.
For all other startup issues, note the LCD panel messages and any system messages that appear onscreen. See "LCD Status Messages (Optional)" on page 23 and "System Messages" on page 37 for more information.
Troubleshooting External Connections
Ensure that all external cables are securely attached to the external connectors on your system before troubleshooting any external devices. See Figure
